desolation vs gloominess

desolation and gloominess both are nouns.

Word	Noun	Adjective	Verb	Adverb
desolation	Yes	No	No	No
gloominess	Yes	No	No	No

As nouns, gloominess is a hypernym of desolation; that is, gloominess is a word with a broader meaning than desolation:

Other hypernyms of desolation include gloom, glumness.

desolation (noun)	gloominess (noun)
an event that results in total destruction	the quality of excessive mournfulness and uncheerfulness
sadness resulting from being forsaken or abandoned	The property of having a frowning or scowling appearance.
the state of being decayed or destroyed	a feeling of melancholy apprehension
a bleak and desolate atmosphere	an atmosphere of depression and melancholy